When 15.3 g of sodium nitrate, NaNO, (85 g/mol), was dissolved in water in a constant-pressure calorimeter, the temperature fell from 25.008 °C to 21.568 °C. If the heat capacity of the solution and the calorimeter is 1339 JC, what is the enthalpy change when 1 mol of sodium nitrate dissolves in water? The solution process is NANO, (s) → Na (aq) + NO, (aq): AH =? A) 20.47 kJ/mol B) 25.59 kJ/mol C) 51.77 kJ/mol D) 79.00 kJ/mol E) 82.90 kJ/mol

when 11.0 g naoh is dissolved in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 25.22c to 48.00c. what is the enthalpy change?

When pure sulfuric acid is dissolved in water, heat is evolved. 10.65 g of pure sulfuric acid at 20.00 °C was added to a calorimeter containing 300 g of water at 20.00 °C. The temperature of the solution increased to 26.35 °C. If the specific heat of the mixture is 4.184 Jg1°C1, the density of water is 1 g/mL, and the heat capacity of the calorimeter is ignored, what is the heat evolved per mole of sulfuric acid? a. -83.2 kJ O b. -73.6 kJ O C. -76.0 kJ d. -80.8 kJ e. -78.4 kJ

In a calorimetric experiment, 6.24 g of lithium hydroxide, LIOH, was dissolved in water. The temperature of the calorimeter rose from 25.0°C to 36.7°C. What is AH for the solution process? LIOH(s) + Li* (aq) + OH (ag) The heat capacity of the calorimeter and its contents is 547 J/°C. ΔΗ- kl/mol

When 6.54 grams of Zn is placed in 500.0 mL of 1.00 M CuSO4(aq) in a coffee cup calorimeter, it reacts completely to displace copper. The temperature of the solution rises from 20.0˚C to 30.4˚C. Assume the coffee cup itself gains no heat and that the solution has the same density (1.00 g/mL) and specific heat (4.184 J/g˚C) as pure water. (a) How much heat does the solution gain during this reaction? (in J)

when 50.0 mL of 0.200 M NaOH is mixed with 50 mL of 0.200 M HCl in a coffee cup calorimeter, the temperature increases from 23.5 degrees C to 26.5 degrees C. Assuming that the density of the resulting solution is 1.00 g/mL and the specific heat capacity of the solution is 4.18 J/g degrees C, what is qrxn?

When an 28.6 g sample of an unknown metal at 142.2 °C is placed into 99.4 g of water at 21.7 °C the final temperature is 31.2 °C. What is the specific heat capacity of the metal in J/g°C

When a sample of titanium was supplied 1.00 kJ of energy, the temperature rose 103.5 °C. If the specific heat of titanium is 0.523 J/g · °C, what is the mass of the titanium sample?

A chemist carefully measures the amount of heat needed to raise the temperature of a 639.0 g sample of C,H,N from -8.7 °C to 6.7 °C. The experiment shows that 2.60 × 10* J of heat are needed. What can the chemist report for the molar heat capacity of C,H,N? Round your answer to 3 significant digits. - 1 ·K J• mol х10